<template>
    <div>
        <!--面包屑导航区域-->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数分类</el-breadcrumb-item>
        </el-breadcrumb>
        <!--卡片视图区域-->
        <el-card>
            <!--头部警告区域-->
            <el-alert class="cat_opt" title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false" show-icon>
            </el-alert>
            <!--选择商品分类区域-->
            <el-row>
                <el-col>
                    <span>选择商品分类：</span>
                    <!--选择商品分类的级联选择框-->
                    <el-cascader v-model="selectedCateKeys" :options="catelist" :props="cateProps"
                                 @change="handleChange"></el-cascader>
                </el-col>
            </el-row>
            <!--tab页签区域-->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!--添加动态参数的面板-->
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">
                        添加参数
                    </el-button>
                    <!--动态参数表格-->
                    <el-table :data="manyTableData" border stripe>
                        <!--展开行-->
                        <el-table-column type="expand">
                            <!--循环渲染tag标签-->
                            <template slot-scope="scope">
                                <el-tag class="el-tag" v-for="(item,i) in scope.row.attr_vals" :key="i" closable
                                        @close="handleClose(i,scope.row)">
                                    {{item}}
                                </el-tag>
                                <!--输入文本框-->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible"
                                          v-model="scope.row.inputValue"
                                          ref="saveTagInput" size="small"
                                          @keyup.enter.native="handleInputConfirm(scope.row)"
                                          @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!--添加按钮-->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+
                                    New Tag
                                </el-button>
                            </template>
                        </el-table-column>
                        <!--索引列-->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit"
                                           @click="showEditDialog(scope.row.attr_id)">编辑
                                </el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete"
                                           @click="removeParams(scope.row.attr_id)">删除
                                </el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!--添加静态参数的面板-->
                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">
                        添加属性
                    </el-button>
                    <!--静态参数表格-->
                    <el-table :data="onlyTableData" border stripe>
                        <!--展开行-->
                        <el-table-column type="expand">
                            <!--循环渲染tag标签-->
                            <template slot-scope="scope">
                                <el-tag class="el-tag" v-for="(item,i) in scope.row.attr_vals" :key="i" closable
                                        @close="handleClose(i,scope.row)">
                                    {{item}}
                                </el-tag>
                                <!--输入文本框-->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible"
                                          v-model="scope.row.inputValue"
                                          ref="saveTagInput" size="small"
                                          @keyup.enter.native="handleInputConfirm(scope.row)"
                                          @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!--添加按钮-->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+
                                    New Tag
                                </el-button>
                            </template>
                        </el-table-column>
                        <!--索引列-->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit"
                                           @click="showEditDialog(scope.row.attr_id)">编辑
                                </el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete"
                                           @click="removeParams(scope.row.attr_id)">删除
                                </el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!--添加参数的对话框-->
        <el-dialog :title=" '添加' + titleText" :visible.sync="addDialogVisible" width="30%" @close="addDialogClose">
            <!--添加参数表单-->
            <el-form :model="addForm" :rules="FormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
        </el-dialog>
        <!--修改参数的对话框-->
        <el-dialog :title=" '修改' + titleText" :visible.sync="editDialogVisible" width="30%" @close="editDialogClose">
            <!--添加参数表单-->
            <el-form :model="editForm" :rules="FormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
        </el-dialog>
    </div>
</template>

<script>
    export default {
        name: "Params",
        data() {
            return {
                // 商品分类列表
                catelist: [],
                // 级联选择器的配置对象
                cateProps: {
                    expandTrigger: 'hover',
                    value: 'cat_id',
                    label: 'cat_name',
                    children: 'children'

                },
                // 级联选择框双向绑定到的数组
                selectedCateKeys: [],
                // 被激活的页签的名称
                activeName: 'many',
                // 动态参数的数据
                manyTableData: [],
                // 静态属性的数据
                onlyTableData: [],
                // 控制添加对话框的显示与隐藏
                addDialogVisible: false,
                // 添加参数的表单数据对象
                addForm: {
                    attr_name: '',
                },
                // 表单的验证规则对象
                FormRules: {
                    attr_name: [
                        {
                            required: true,
                            message: '请输入参数名称',
                            trigger: 'blur'
                        }
                    ]
                },
                // 控制修改对话框的显示与隐藏
                editDialogVisible: false,
                // 修改的表单数据对象
                editForm: {},
            }
        },
        created() {
            this.getCateList()
        },
        methods: {
            async getCateList() {
                const {data: res} = await this.$http.get('categories')
                if (res.meta.status !== 200) {
                    return this.$message.error('获取商品列表失败！')
                }
                this.catelist = res.data
            },
            // 级联选择框选中项变化触发函数
            handleChange() {
                this.getParamsData()
            },
            //获取参数的列表数据
            async getParamsData() {
                // 如果选中的不是三级分类，就清空选中的内容
                if (this.selectedCateKeys.length !== 3) {
                    this.selectedCateKeys = []
                    this.manyTableData = []
                    this.onlyTableData = []
                    return
                }
                // 根据所选分类的id，和当前所处的面板，获取对应的参数
                const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {sel: this.activeName}})
                if (res.meta.status !== 200) {
                    return this.$message.error('获取参数列表失败！')
                }
                //把每个参数的属性都转换为数组，这样就可以让tag标签循环渲染
                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                    // 控制文本框的显示与隐藏
                    item.inputVisible = false
                    //文本框中输入的值
                    item.inputValue = ''
                })
                if (this.activeName === 'many') {
                    this.manyTableData = res.data
                } else {
                    this.onlyTableData = res.data
                }
            },
            // tab页签点击事件处理函数
            handleTabClick() {
                this.getParamsData()
            },
            // 对话框的关闭事件
            addDialogClose() {
                this.$refs.addFormRef.resetFields()
            },
            // 点击按钮添加参数
            addParams() {
                this.$refs.addFormRef.validate(async valid => {
                    if (!valid) return;
                    const {data: res} = await this.$http.post(`categories/${this.cateId}/attributes`, {
                        attr_name: this.addForm.attr_name,
                        attr_sel: this.activeName
                    })
                    if (res.meta.status !== 201) {
                        return this.$message.error('添加参数失败！')
                    }
                    this.$message.success('添加参数成功！')
                    this.addDialogVisible = false
                    this.getParamsData()
                })
            },
            // 点击按钮，展示修改对话框
            async showEditDialog(attr_id) {
                // 查询当前参数信息
                const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {params: {attr_sel: this.activeName}})
                if (res.meta.status !== 200) {
                    return this.$message.error('获取参数信息失败！')
                }
                this.editForm = res.data
                this.editDialogVisible = true
            },
            // 关闭修改窗口
            editDialogClose() {
                this.$refs.editFormRef.resetFields()
            },
            // 点击按钮修改参数信息
            editParams() {
                this.$refs.editFormRef.validate(async valid => {
                    if (!valid) return;
                    const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
                        attr_name: this.editForm.attr_name,
                        attr_sel: this.activeName,
                        attr_vals:this.editForm.attr_vals
                    })
                    if (res.meta.status !== 200) {
                        return this.$message.error('修改参数失败！')
                    }
                    this.$message.success('修改参数成功！')
                    this.getParamsData()
                    this.editDialogVisible = false
                })
            },
            // 根据id删除对应的参数项
            async removeParams(attrId) {
                const confirmResule = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                }).catch(err => err)
                if (confirmResule !== 'confirm') {
                    return this.$message.info('已取消删除！')
                }
                const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
                if (res.meta.status !== 200) {
                    return this.$message.error('删除参数失败！')
                }
                this.$message.success('删除参数成功！')
                this.getParamsData()
            },
            //文本框失去焦点或按下了Enter都会触发
            async handleInputConfirm(row) {
                if (row.inputValue.trim().length === 0) {
                    row.inputValue = ''
                    row.inputVisible = false
                    return
                }
                row.attr_vals.push(row.inputValue.trim())
                row.inputValue = ''
                row.inputVisible = false
                this.saveAttrVales(row)
            },
            //将对 attr_vals的操作，保存到数据库
            async saveAttrVales(row) {
                const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
                    attr_name: row.attr_name,
                    attr_sel: row.attr_sel,
                    attr_vals: row.attr_vals.join(' ')
                })
                if (res.meta.status !== 200) {
                    return this.$message.error('修改属性失败！')
                }
                this.$message.success('修改属性成功！')
            },
            // 点击按钮展示文本输入框
            showInput(row) {
                row.inputVisible = true
                this.$nextTick(_ => {
                    this.$refs.saveTagInput.$refs.input.focus();
                });
            },
            // 删除对应的参数可选项
            handleClose(i, row) {
                row.attr_vals.splice(i, 1)
                this.saveAttrVales(row)
            }
        },
        computed: {
            // 如果按钮需要被禁用，则返回true，否则false
            isBtnDisabled() {
                if (this.selectedCateKeys.length !== 3) {
                    return true
                }
                return false
            }
            ,
            // 当前选中的三级分类的id
            cateId() {
                if (this.selectedCateKeys.length === 3) {
                    return this.selectedCateKeys[2]
                }
                return null
            }
            ,
            // 动态计算标题的文本
            titleText() {
                if (this.activeName === 'many') {
                    return '动态参数'
                }
                return '静态属性'
            }
        }
    }
</script>

<style scoped>
    .cat_opt {
        margin: 15px 0;
    }

    .el-tag {
        margin-left: 10px;
    }

    .input-new-tag, .button-new-tag {
        margin-left: 10px;
        width: 100px;
    }
</style>